No matter how well-insulated your attic maybe, heat radiating into the attic space will result from direct sunlight on your roof. From the inside out, this extended exposure to extreme heat will damage your shingles and sheathing. This heat can also encourage moisture accumulation and mould formation, combined with moisture and a lack of airflow.
For both your roof and your family, ventilation helps preserve a safe attic room. By pushing hot air out into the environment while still bringing fresh, cool air into the attic, Attic fans carry out this ventilation. The effect is a cooler attic room with a lot of air exchange, which helps protect against mould.
To help regulate the temperature of an attic room, a few different fan types can be used. Their responsibilities vary somewhat. Your home might be best fitted to one or the other of the following styles, depending on its style.
A different purpose is fulfilled by attic fans, removing the hot and damp air from the attic and leaving the room alone under the attic floor. Inside the attic, these fans pump the air, drawing fresh air from the vents (such as those in your soffit) and moving hot air outside.
A year-round purpose can be served by attic fans. You can reduce the temperature in the attic significantly in the summer, helping to prolong the life of the roofing shingles and sheathing.
Attic fans can help you prevent harm caused by ice dams in colder months as well. The fans cool the attic, and the temperature between the attic and outside the home is equalised. When it enters the cold gutter, this stops snow from melting on your roof and freezing.
It's important to take into account how well your attic is shielded off from the rest of the building when installing an attic fan. If your attic door or hatch is especially draughty, air-conditioned or heated air will be drawn through the gaps by turning the fan on. You don't want the neighbourhood to heat up or cool down.
Attic Ventilation fans Pros:
The aim of an attic fan is to discharge hot air from the building via the attic and exchange it with cooler outside air. Therefore, the safest time to use an attic fan is in the afternoon after the sun sets, and preferably when the outside temperature is below 70 F. Attic fans are more environmentally friendly than air conditioning units, as they usually use no more than 10 to 15 per cent of the power used to operate an air conditioning unit, making an attic fan a cooling alternative that is more economical.
In the right conditions, attic fans are very effective in keeping homes cool, and that means that your home is going to be more pleasant for less money. In the hottest part of the day, as long as you keep your home locked up and then open your window frames in the evening and morning to let the fan work its wonders, you will be able to maintain your home cooler throughout the summer.
Attic Ventilation fans Cons:
Outdoor air usually has moisture in it, and air conditioners fight this humidity in their attempt to keep the home cool. Attic fans do not work well in combination with air conditioners. This will require an air conditioner to work much harder because attic fans are designed to pull in outside air, which is why these two machines are not designed to work together.
Since attic fans rely on cooler temperatures and preferably dry air at night, they are not successful in all climates, particularly if the nighttime temperature does not drop below 80 F where you live. Attic fans are not always recommended. In addition, if your water heater or boiler is located in the attic, then the best option for your house would not be an attic fan. Finally, since attic fans need you to keep your windows open during the night, in neighborhood that have security concerns, they don't always make sense.